Date.prototype.format = function(mask) {     
    
    var d = this;     
    
    var zeroize = function (value, length) {     
    
        if (!length) length = 2;     
    
        value = String(value);     
    
        for (var i = 0, zeros = ''; i < (length - value.length); i++) {     
    
            zeros += '0';     
    
        }     
    
        return zeros + value;     
    
    };       
    
    return mask.replace(/"[^"]*"|'[^']*'|\b(?:d{1,4}|m{1,4}|yy(?:yy)?|([hHMstT])\1?|[lLZ])\b/g, function($0) {     
    
        switch($0) {     
    
            case 'd':   return d.getDate();     
    
            case 'dd':  return zeroize(d.getDate());     
    
            case 'ddd': return ['Sun','Mon','Tue','Wed','Thr','Fri','Sat'][d.getDay()];     
    
            case 'dddd':    return ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'][d.getDay()];     
    
            case 'M':   return d.getMonth() + 1;     
    
            case 'MM':  return zeroize(d.getMonth() + 1);     
    
            case 'MMM': return ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'][d.getMonth()];     
    
            case 'MMMM':    return ['January','February','March','April','May','June','July','August','September','October','November','December'][d.getMonth()];     
    
            case 'yy':  return String(d.getFullYear()).substr(2);     
    
            case 'yyyy':    return d.getFullYear();     
    
            case 'h':   return d.getHours() % 12 || 12;     
    
            case 'hh':  return zeroize(d.getHours() % 12 || 12);     
    
            case 'H':   return d.getHours();     
    
            case 'HH':  return zeroize(d.getHours());     
    
            case 'm':   return d.getMinutes();     
    
            case 'mm':  return zeroize(d.getMinutes());     
    
            case 's':   return d.getSeconds();     
    
            case 'ss':  return zeroize(d.getSeconds());     
    
            case 'l':   return zeroize(d.getMilliseconds(), 3);     
    
            case 'L':   var m = d.getMilliseconds();     
    
                    if (m > 99) m = Math.round(m / 10);     
    
                    return zeroize(m);     
    
            case 'tt':  return d.getHours() < 12 ? 'am' : 'pm';     
    
            case 'TT':  return d.getHours() < 12 ? 'AM' : 'PM';     
    
            case 'Z':   return d.toUTCString().match(/[A-Z]+$/);     
    
            // Return quoted strings with the surrounding quotes removed     
    
            default:    return $0.substr(1, $0.length - 2);     
    
        }     
    
    });     
    
};